Carburetor



Dec. 27, 1927.' 1,653,628

v. R. HEFTLER CARBURETOR Filed Dec. 27. 1921 IHHHHHM Patented` Dec. 27, 1927i.

y UNITED STATES PATENT oFFlcE.

VICTOR R. HEFTLER, OF DETROIT, MICHIGAN, ASSIGNOR TO ASOCIETE DU' CARBURA- TEUR ZENITH, OF LYON,FRANCE, A CORPORATION O F FRANCE. l

GARCBUBETOR.

Application led December 27, i921. Serial No. 524,848.

Fi ke 1 is a longitudinal section on the -line -I of Figure 2; and

Figure 2 is a. sectional view on the line II-II of Figure 1, looking in the direction of the arrows.y 1

The present invention relates broadly Vto carburetors, and more particularly to carburetors of the type generally disclosed in Patent 1562,806, granted to Richard VH. Taylor, ov. 24, 1925, having a low speed feeding device terminating 4at such position Within the carbureting passage as to be effected by the position of the throttle.

In carburetors of this general type, it is not uncommon to feed the slow speed feeding device from a well open to the atmosphere in, such manner that an emulsion is supplied by the slow speed feeding device to the carbureting passage. 'By the term 2c emulsion as used herein, I mean a mixture of fuel and air in which the fuel is in more or less globular form and the air more or less in the form of bubbles. Such a construction makes it possible to provide an adjustment for the slow speed feeding device by varying the amount of air in the emulsion.

It has also been proposed, as disclosed, for

example, in the application referred to, to

so provide a second well open to the atmosphere and fed from the first well in such Inannei` that it receives fuel only when the engine supplied by the carburetor is at rest, the fuel therein being exhausted by an auxiliary fuel a5 feed discharging into the carbureting passage independently of the slow speed feeding device, and effective only for starting. An

important object of the present invention is to combine this auxiliary fuel feed with the 4o slow speed feeding device in a novel and elficient manner.

The foregoing and other objects of the invention, together with their attendant ad vantages will be more clearly apparent as Aa5 the invention becomes better understood, itl

vbeing vpremised that changes may be made in the construction and operation without v departing from the spirit of the invention or scope of my broader claims.

A carburetor embodymg the present invention may comprise a constant level chamber 2 receiving fuel in any well known manner and delivering the same through a chanvery nearly equal to the leve A threaded engagement of relatively high pitch with some portion of the body of the carburetor, and is adapted to be operated from the dash board of the vehicle by any Well known form of mechanism, not shown,

whereby the fuel feed is under/i the control of the driver of the vehicle. This constitutes a valuable feature yof the present invention, as will be more fully pointed out hereinafter.

Extending into the atmospheric well 7 is a tube, or quill, as it is termed in the art.v This quill 11 has its lower end terminating below the fuel level and adjacent the plug 9, and its upper end delivering through a restricted orifice 12 to the passage 13. passage has leading therei'nto at an angle a second passage 14 which discharges into the carbureting passage 5 adjacent the throttle 6.` With such a construction it will be apparent that with the throttle slightly opened thereI will be a flow of pure fuel through the quill l1 into the carbureting passage, this fuel being mixed with the air passing through the carbureting passage to form a combustible mixture.

Adjacent the atmospheric well 7 is a second well 15 having a suitable opening 16 to the atmosphere. Thewell 15 is supplied This with fuel through an orifice 17 which is slightly below the normal level of the fuel in the constant level chamber and the highest level of the fuel in the atmospheric well 7. This construction is such that the well 15 Will only be supplied with fuel when the level of the fuel in the atmos heric well 7 is Tof the fuel in the constant level chamber. Extending into the AWell 15 and terminating adjacent the bottom thereof is a second uill d8 which discharges at its upper en into the passage A13. The iow through this second quillinto needle valve 19.

` The well .7 also su plies' fuel to the compensating fuel feed get in a well kiown manner, whereby with the carburetor supplying fuel `in normal manner to the engine, the fuel level in the well 7 will be kept vbe- 'standstill,'the fuel from the constant level low the level of the fuel lin the constant levell chamber. The ra idity with which this lowering occurs wi be artly determined by the. position ofthe need e valve 10.

Assuming .the engine to be at an absolute chamber will reach the same level inall of the passages. As sodn as the engine is started, the fuel level in the main `atmospheric well 7 will drop due to the effect of the slow speed feeding deilice terminating adjacent the throttle. 'lhe orifice 17 is so positioned that it will be slightly above this 'new level assumed by the fuel in the main atmospheric well. When theengine is started, the throttle valve being kept. in a nearlyl closed position, the high vacuum obtained will not only draw fuel from the well 7 throu h the slow s eed feeding device as describe but will a so draw pure fuelfr'om the well 1 5 through the supply from t e well 15 at this time is very helpful in starting.

Immediately after the engine has started and the first inrus'h has taken' place, the en? vgine will b working under suction and will maintain theJ level of the fuel in the atmosphericn/well 7 below the orifice 17 This will prevent the auxiliary well 15 from receivlng any incre fuel until the engine is again brought-to rest.I Witlrthe well 15 receivin no supply, itwill be quickly emptied, an

thereafterlthe quill 18 will supply nothing but air to the passage 13. The amount of air so supplied may beeasily regulated by adjusting the needle -valve 19.

The carbureting passage vis preferably con-I structed of an lupper s ection 21 of some inexpensive material which may .be of a corrodible nature, and `a lower section 22 which may be integral with the float chamber. @he a 'section 22 is preferablyof more .expenslve material of a non-corrodible nature made necessary due both to the presence of 'acids and water in present day fuels. These sections, bein separable, permit the assembly of the qui s as wellv as the easy'machining Aof the parts.4 llhe 4venturi per se may be composed of a cheap alloy die casting. These features of the resent invention are described vand olaime in my co-pendlng application Serial No. 531,647 filed January 25 1922. A

ll`rom the foregoing it will lie-.apparent that the quill 7 never supplies anythmg but pure fuel, and thatl exce t for a brief intermediate period the quil 18 suplies either pure fuel or pure air. Both of ese quills uill 18. This auxiliary fuel l. A carburetor having a constant level y chamber, a carbureting passage, a throttle valve in said passage, an atmospheric well, means to feed fuel to said well, a fuel feeding device communicating with said well and terminating adjacent the throttle, a secon'd fuel feeding device from said well terminating below the throttle, a second atmospheric well communicating with the first atmospheric well below the normal fuel level 1 of thefuel in the constant level chamber and 1 above the fuel feed to theffirst mentioned atmospheric well, and an auxiliary suction fuel feed eommunicatingwith said second well at one end and 'said device at the'other end tox supply additional fuel to the carsubstantially `as described.

2. A carburetor having a constant level chamber, a carbureting'passage, a throttle. valve in said passage, an atmospheric well, means for feeding fuel directly from the atmospheric Well to an up er portion of the carbureting passage, mean for feeding fuel from the atmospheric well to the lower porbureting passage at predetermined times,

'tion of the carbureting passage, means for feeding fuel from the constant level chamber to the atmospheric well, a second well in communication with the upper ortion ofl the atmospheric well, and an aum 'ary feed for temporarily feeding additional fuel directly from the second well to said rst men# tioned fuel feeding, means, substantially as described 3. A carburetor havinga: constant level chamber, a carbureting passage, a throttle valve-in said passage an atmospheric well, means for feeding fuel directly from the atmospheric well to the carbureting passage below said throttle, means for feedin fuel mospheric well, a second well in communipheric well just elow the normal level in the 'constant level chamber, and an auxiliary Yfrom the constant leyel chamber to t 'e at. i y

feed for temporarily feeding additional fuel directly from the second; well to said rst mentioned fuel feeding means, said first mentioned fuel feeding means being con- W1. In a carburetor having a constant level structed to feed fuel only to the carbureting `wir chamber, a carbureting passage, athrottle of said fuel feeding means receiving its fuel in said passage, a nozzle feeding fuel from from a source having a level fluctuation in the constant level chamber to said passage, a excess of that in the constant level cham- 10 secondary nozzle terminating adjacent the ber, substantially as described.

5 throttle for delivering fuel to said passage, In testimony whereof Lhave hereunto set and a plurality of fuel feeding means de-V my hand. livering fuel to said secondary nozzle, one VICTOR R. 

